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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38dd02004ca5ef75efd9a8572b00f2fc559f171b5e0aea5ad54d7efa39ea113' 
  AND token = 'OtSYApeB3D6OpVk9FenEAtAhfimqze95h7K+Nojx4JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}